Permanent Magnetic Bias Unilateral Axial Magnetic Suspension Bearing

Abstract

The invention relates to a permanent magnet biased unilateral axial magnetic suspension bearing which is generally pairwise used and belongs to a mixed type magnetic suspension bearing. The permanent magnet biased unilateral axial magnetic suspension bearing is characterized in that an inner magnetic pole of a stator and an outer magnetic pole of the stator are put at one side of an end thrust disc; the step surface of the end thrust disc is used as a magnetic pole surface; an axial magnetizing annular permanent magnet and a control winding are used for respectively establishing a biased magnetic field and a control magnetic field in the stator and an air gap between the outer magnetic pole and the end thrust disc, and after the magnetic suspension bearings are pairwise used, the axial displacement control is realized; cooling holes are formed in the stator and the outer magnetic pole. The permanent magnet biased unilateral axial magnetic suspension bearing is convenient to install and dismantle, relatively small in radius of the thrust disc, low in power dissipation, small in size and capable of overcoming static bias force on a rotor, has relatively good cooling capacity and broad prospect in various magnetic suspension systems and is particularly suitable for occasions where the wind damage of high-speed gas compressors, expansion engines and the like are main loss of the magnetic suspension bearings.

Description

technical field [0001] The invention relates to a magnetic suspension bearing, in particular to a permanent magnetic bias single-side axial magnetic suspension bearing. Background technique [0002] The basic principle of the magnetic suspension bearing is to use the magnetic force between the stator core and the rotor core to realize the non-contact support of the rotor. Since the magnetic force does not require a medium, there is no mechanical contact between the stator and the rotor. [0003] The magnetic suspension bearing has the following main advantages: (1) The rotor can operate at an ultra-high speed, and the theoretical speed is only limited by the rotor material; (2) The characteristics of no contact, no lubrication and no wear make the magnetic suspension bearing applied to clean and bacteria space, vacuum system, low temperature environment, etc., even in high temperature environment; (3) bearing loss is very low, only 1 / 20 to 1 / 5 of traditional ball bearings o...

AI Technical Summary

Problems solved by technology

However, due to the fact that the bias current is much larger than the control current under stable conditions, more power loss is caused by the winding, and the volume and weight required to generate the unit bearing capacity are relatively large.

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